Engineering Materials Practice Set-8

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1. Argentite is the principal ore or raw material for

Silver

Zinc

Tin

Aluminium

2. Which of the following is used for bearing liner?

Bell metal

Babbitt metal

Gun metal

Bronze

3. Steel made from phosphate iron is

Brittle

Tough

Ductile

Hard

4. Aluminium bronze contains aluminium and copper in the ratio of

60 : 40

40 : 60

10 : 90

50 : 50

5. Gun metal contains

70 - 78% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

6. Which is false statement about tempering? Tempering is done to

Improve toughness

Improve machinability

Release stresses

Improve ductility

7. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Iron, zinc and bismuth

Copper, nickel and antimony

Nickel, copper and zinc

8. Permalloy is a

Polymer

Nickel and iron alloy having high permeability

None ferrous alloy

Kind of stainless steel

9. Cupola produces following material

Pig iron

Cast iron

Wrought iron

Malleable iron

10. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.6 to 0.7%

0.7 to 0.9%

0.25 to 0.5%

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11. Corrosion resistance of steel is increased by adding

Chromium and nickel

Aluminium and zinc

Nickel and molybdenum

Tungsten and sulphur

12. Connecting rod is usually made of

Medium carbon steel

Low carbon steel

Aluminium

High carbon steel

13. Sulphur in cast iron

Aids fusibility and fluidity

Increases hardness and brittleness

Makes the iron soft and easily machinable

Make the iron white and hard

14. Chromium in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Gives ductility, toughness, tensile strength and anti-corrosion properties

15. Which of the following is the binding material in cemented carbides?

Cobalt

Nickel

Iron

Vanadium

16. Compressive strength of grey cast iron in tonnes/cm is of the order of

710

57

1015

35

17. Tungsten in high speed steel provides

Wear resistance

Toughness

Sharp cutting edge

Hot hardness

18. Phosphor bronze contains

1% phosphorous

2.5% phosphorous

None of the above

0.5% of phosphorous

19. High carbon steel carries carbon percentage

0.1 to 0.3%

0.8 to 1.5%

0.3 to 0.6%

0.6 to 0.8%

20. The crystal structure of brass is

H.C.P.

B.C.C.

F.C.C.

Orthorhombic crystalline structure

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21. The alloy used for making electrical resistances and heating elements is

Invar

Elinvar

Nichrome

Magnin

22. Hardness of upper bainite (acicular structure) is about

RC 65

RC 80

RC 57

RC 48

23. The hardness of steel increases if it contains

Pearlite

Austenite

Cementite

Martensite

24. The machinability of steel is increased by

Phosphorous, lead and sulphur

Silicon and sulphur

Phosphorous and aluminium

Sulphur, graphite and aluminium

25. The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets

Can cut another metal

Breaks with little permanent distortion

Can be drawn into wires

26. Manganese in steel increases its

Hardness

Ductility

Fluidity

Tensile strength

27. Melting point of iron is

1601°C

1539°C

1712°C

1489°C

28. The presence of sulphur in pig iron makes

It brittle

It easily machinable

It hard

The casting unsound

29. Shock resisting steels should have

Low wear resistance

Low tensile strength

Low hardness

Toughness

30. Carbon in iron is an example of

Intermetallic compounds

Interstitial solid solution

All of the above

Substitutional solution

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31. Nimonic contains __________ percentage of nickel as that of Inconel.

More

None of these

Less

Same

32. Preheating is essential in welding

All of the above

Cast iron

High speed steel

All nonferrous materials

33. Weld decay is the phenomenon found with

Mild steel

Stainless steel

Cast iron

Nonferrous materials

34. Delta metal is an alloy of

Copper, zinc and iron

Iron, lead and tin

Iron, nickel and copper

Iron, aluminium and magnesium

35. Cold rolled steel sheets contain carbon of the following order

0.4%

0.2%

0.1%

0.6%

36. Free cutting steels

Require least cutting force

Do not exist

Are used where ease in machining is the criterion

Contain carbon in free form

37. Beryllium bronze has

(B) High fatigue limit

(A) High yield point

(C) Both (A) and (B)

(D) None of these

38. An example of amorphous material is

Lead

Zinc

Glass

Silver

39. The alloying element which reduces the formation of iron sulphide in steel is

Manganese

Nickel

Chromium

Vanadium

40. Bronze contains

70% copper and 30% zinc

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70 - 75% copper and rest tin

Engineering Materials Practice Set-8

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